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+ Some change in the Cache_File use:
- The fileNameProtection is forced to false when setting the cache option
- Add a File_Archive_cleanCache function
To remove the cached compressed version of the files that are no longer present on the system, call
$cache->clean(false, 'callback_File_Archive_cleanCache');
where $cache is the Cache_Lite object passed to File_Archive.

+ Introduce 'blockSize' option that indicates the size of the blocs copied from a reader to a writer when
extracting a file. The default has been set to 64kB but is subject to change in future releases

+ File_Archive::cache to cache a reader if you read it several times in the same script

+ 'cacheCondition' option. With this option, you can specify you want to cache all the http
transfer for example. Caching an http transfer ensure that the file won't be downloaded several times